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from __future__ import annotations
import hashlib
import json
import os
from collections.abc import Sequence
from pre_commit import lang_base
from pre_commit.prefix import Prefix
from pre_commit.util import CalledProcessError
from pre_commit.util import cmd_output_b
ENVIRONMENT_DIR = 'docker'
PRE_COMMIT_LABEL = 'PRE_COMMIT'
get_default_version = lang_base.basic_get_default_version
health_check = lang_base.basic_health_check
in_env = lang_base.no_env # no special environment for docker
def _is_in_docker() -> bool:
try:
with open('/proc/1/cgroup', 'rb') as f:
return b'docker' in f.read()
except FileNotFoundError:
return False
def _get_container_id() -> str:
# It's assumed that we already check /proc/1/cgroup in _is_in_docker. The
# cpuset cgroup controller existed since cgroups were introduced so this
# way of getting the container ID is pretty reliable.
with open('/proc/1/cgroup', 'rb') as f:
for line in f.readlines():
if line.split(b':')[1] == b'cpuset':
return os.path.basename(line.split(b':')[2]).strip().decode()
raise RuntimeError('Failed to find the container ID in /proc/1/cgroup.')
def _get_docker_path(path: str) -> str:
if not _is_in_docker():
return path
container_id = _get_container_id()
try:
_, out, _ = cmd_output_b('docker', 'inspect', container_id)
except CalledProcessError:
# self-container was not visible from here (perhaps docker-in-docker)
return path
container, = json.loads(out)
for mount in container['Mounts']:
src_path = mount['Source']
to_path = mount['Destination']
if os.path.commonpath((path, to_path)) == to_path:
# So there is something in common,
# and we can proceed remapping it
return path.replace(to_path, src_path)
# we're in Docker, but the path is not mounted, cannot really do anything,
# so fall back to original path
return path
def md5(s: str) -> str: # pragma: win32 no cover
return hashlib.md5(s.encode()).hexdigest()
def docker_tag(prefix: Prefix) -> str: # pragma: win32 no cover
md5sum = md5(os.path.basename(prefix.prefix_dir)).lower()
return f'pre-commit-{md5sum}'
def build_docker_image(
prefix: Prefix,
*,
pull: bool,
) -> None: # pragma: win32 no cover
cmd: tuple[str, ...] = (
'docker', 'build',
'--tag', docker_tag(prefix),
'--label', PRE_COMMIT_LABEL,
)
if pull:
cmd += ('--pull',)
# This must come last for old versions of docker. See #477
cmd += ('.',)
lang_base.setup_cmd(prefix, cmd)
def install_environment(
prefix: Prefix, version: str, additional_dependencies: Sequence[str],
) -> None: # pragma: win32 no cover
lang_base.assert_version_default('docker', version)
lang_base.assert_no_additional_deps('docker', additional_dependencies)
directory = lang_base.environment_dir(prefix, ENVIRONMENT_DIR, version)
# Docker doesn't really have relevant disk environment, but pre-commit
# still needs to cleanup its state files on failure
build_docker_image(prefix, pull=True)
os.mkdir(directory)
def get_docker_user() -> tuple[str, ...]: # pragma: win32 no cover
try:
return ('-u', f'{os.getuid()}:{os.getgid()}')
except AttributeError:
return ()
def docker_cmd() -> tuple[str, ...]: # pragma: win32 no cover
return (
'docker', 'run',
'--rm',
*get_docker_user(),
# https://docs.docker.com/engine/reference/commandline/run/#mount-volumes-from-container-volumes-from
# The `Z` option tells Docker to label the content with a private
# unshared label. Only the current container can use a private volume.
'-v', f'{_get_docker_path(os.getcwd())}:/src:rw,Z',
'--workdir', '/src',
)
def run_hook(
prefix: Prefix,
entry: str,
args: Sequence[str],
file_args: Sequence[str],
*,
is_local: bool,
require_serial: bool,
color: bool,
) -> tuple[int, bytes]: # pragma: win32 no cover
# Rebuild the docker image in case it has gone missing, as many people do
# automated cleanup of docker images.
build_docker_image(prefix, pull=False)
entry_exe, *cmd_rest = lang_base.hook_cmd(entry, args)
entry_tag = ('--entrypoint', entry_exe, docker_tag(prefix))
return lang_base.run_xargs(
(*docker_cmd(), *entry_tag, *cmd_rest),
file_args,
require_serial=require_serial,
color=color,
)
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